You may be suffering from a combination of acne and something called folliculitis. Folliculitis is a localized infection of the hair follicles that can often occur on the face when there is pronounced hair and on the thighs as well. I would schedule an appt with a dermatologist so that different treatment options can be discussed with you. Getting the acne/folliculitis under control first is crucial, then chemical peels/laser can be used to correct pigmentation.
I am sorry you have been suffering for so long with acne. Please find a good board certified dermatologist to help you. There are so many treatments that can help including pills and chemical peels. You should be able to get this under control with help.